Playing roms on a Switch means you’re NOT emulating, that’s the reason people jailbreak them. Plenty of Switch games run like crap on a Steam Deck, and the more demanding games are difficult to get running at all via emulation.
I’m not saying a jailbroken Switch is the best option, I’m just saying there are pros and cons. Honestly, I’d recommend OP get a cheap desktop PC with a budget GPU instead of a Steam Deck, unless they need it to be portable. It would perform better for emulation.
Damn, that hits hard